class settings:
    def __init__(self):
        self.screen_height = 1200
        self.screen_width = 800
        self.bg_color = (230, 230, 230)  # 背景色
        self.title = 'Alien Invasion'
        # ----------- ship -----------------
        self.ship_image = 'assets/b2.jpeg'
        self.ship_size = (80, 60)
        self.ship_speed_factor = 1.5
